Questions tagged [torque]
For questions about torque as it relates to electronics. Consider using in conjunction with related tags such as "motor" (and more specific motor-related tags), if applicable.
338
questions
1
vote
0
answers
18
views
Does "Torque control" using FOC consider input (battery) voltage drop?
All information related to Torque Control using FOC technique consider a current control, so they suppose a correlation between req_Id (Id desired) and requested mechanical torque. PI regulators ...
1
vote
1
answer
57
views
How do I find the torque of a simple electrical motor?
I created a simple electric motor following Khan Academy's tutorial, and now I am trying to figure out how I can find the torque from it (which should be quite small).
Here is an image of the setup ...
- 27
0
votes
1
answer
21
views
Variable BLDC load
I need to test several BLDC motors and their ESCs, primarily to determine the motor's capability and power consumption, as well as the ESC's ability to drive the motor at higher current. Aside from ...
- 193
0
votes
1
answer
49
views
How to find the back-EMF constant of BLDC motor from a motor technical data?
I have a BLDC motor with these info (please don't pay attention to the striped column):
How from these info, how can I get the Back-emf constant ? Is it just 36V/4krpm = 9 V/krpm ?
Thank you a lot.
- 13
0
votes
0
answers
56
views
Correct understanding of torque constant for BLDC using FOC
I have a BLDC motor with sinusoidal windings that I drive with FOC technique. With my recent knowledge earned by implementating FOC, I got confused with the typical motor constant given in ...
0
votes
2
answers
33
views
Maximum torque conditions
Suppose the following machinery :
The induced torque is given by the following formula :
where K is a constant which depends on the motor construction. Bs is the constant (in magnitude and in ...
- 2,740
0
votes
1
answer
46
views
Torque in kg·cm vs N·cm (servo vs rotary switch)
I don't understand the different specifications of the maximum force of a servo motor vs the torque of a rotary switch. In the following example, there is a servo spec'ed at "Maximum Torque at 6V:...
- 239
3
votes
3
answers
329
views
Torque control of a BLDC motor
Please forgive my lack of perfect electronics knowledge. I am here to learn.
I understand I am clearly missing and misunderstanding something important. The aim of this question is to find out what it ...
- 31
0
votes
0
answers
51
views
Designing a unipolar stepper driver using STM32 MCU, lack of torque
I am working on my first robotics project which will hopefully become a desktop sized KUKA iiwa. Unfortunately, I have only just completed the first year of my electrical engineering degree so have ...
0
votes
0
answers
33
views
What is rotor torque in the stepping motor context?
I have the following datasheet for a stepping motor.
I am wondering what "Rotor Torque" means in the stepping motor context. My first guess would be the torque produced by the rotor under ...
- 839
0
votes
1
answer
252
views
Calculating the torque and RPM requirements for a DC motor
Say I'd like to calculate the motor specs required for lifting a 1kg weight at a rate of 1 m/s. How much torque and RPM should the motor have, assuming a wheel radius of 1cm?
My calculations are as ...
- 105
0
votes
2
answers
56
views
How do I calculate the RPM and torque of a 12 V DC motor that gets 5 V?
I have a PCB that outputs 5 V to each of the two motors. It was part of a robotics kit that included two 12 V 360 RPM motors.
I want to attach a 12 V DC motor with 3500 RPM. How do I calculate how ...
1
vote
0
answers
87
views
Loading an induction machine after starting unloaded
I work with compressors and usually the starting characteristic for fixed speed machines with starters is that the machine starts unloaded (star starter), after that the compressor unit is loaded and ...
- 21
0
votes
1
answer
30
views
Can you design a DC motor with any arbitrary torque speed curve?
Title pretty much says it all. I have a low-rpm (30-160) and moderate-torque (2 N-m) application. These characteristics are pretty easy to hit with an off-the-shelf dc motor + gearbox. But let's say I ...
0
votes
1
answer
55
views
Can not get maximum torque (stall torque) when current reach peak current
I am using FOC to control torque of 220V AC servo (SPMSM) with 36V power supply at low speed (100-200rpm).
I tested with some servos (different manufacturers) which has specs as the below table. But I ...
- 1
1
vote
1
answer
61
views
Will running four motors (two high speed and two high torque) get the robot rolling? [closed]
I've been building a 2WD robot for 3 months now and been switching the motors frequently and been running into the same issue - low torque.
I had these low RPM, high torque motors around and thought: ...
- 13
0
votes
0
answers
36
views
VFD Driving a 40HP Inverter Rated Motor showing high Torque, Output Current at Low Speed
I am having some difficulty troubleshooting a Toshiba VFAS3-4300PC. I am using it to run a 40HP inverter rated motor that is driving a VRU Screw Compressor. I have the frequency range set for 12-60Hz. ...
0
votes
0
answers
44
views
BLDC torque and speed control
Actually I drive a DC motor in speed and torque at the same time. I would like to know if there is a solution to do the same with a BLDC. The motor is 50W max.
I can make a custom PCB to use a BLDC ...
0
votes
0
answers
46
views
DC Motor Sizing and Modelling for Hoist
I am currently doing an assignment which asks for the design of a hoist to be installed on the 3rd floor of a building and is required to safely lift and lower a maximum mass of 300kgs. We have not ...
- 1
1
vote
2
answers
131
views
Achieving zero torque from DC motor
The current project I am working on requires a motor to provide ~2 Nm to a spinning shaft and then upon command provide ~0 Nm, hence acting like a bearing. The motor will have an attached encoder, and ...
- 11
2
votes
2
answers
366
views
How can I connect two motors in parallel with different RPM and voltage?
I have a kid's electric toy car with a 12 V battery and 2 DC motors (Model: RS380/6 V & 12 V with 15000 RPM) connected to battery in parallel and to wheels using gearboxes. For some reason, the 6 ...
- 423
0
votes
1
answer
85
views
Reverse engineering a torque sensor
I am trying to reverse engineer a torque sensor. I have found the two data lines that are providing the torque value output to the ECU. Here are the waveforms that I have captured that show max. ...
- 341
0
votes
1
answer
341
views
Torque to FOC Iq current conversion
I am controlling the quadrature current (Iq) of this BLDC using the TMC4671 FOC controller. The FOC control seems to work fine, but the end goal is to control the real torque produced by the motor.
I ...
- 79
1
vote
2
answers
125
views
DC motor efficiency
I would like to build a Moment of Inertia machine:
A machine that rotates an object (with a DC motor) and can also record the angular velocity and use this to find the moment of inertia.
Initially I ...
- 11
0
votes
0
answers
57
views
Need help figuring out how to organise a system to run a stepper motor at low speed without Steps-skipping
TL;DR : How to prevent step-skipping with a NEMA gearbox motor at low speed.
Edit: following @glen_geek comment, removing the load on the system seems to remove the problem, hinting at inertia and ...
0
votes
0
answers
25
views
How much lower than the ideal torqe curve is the actual torque of a PMSM running at overspeed?
VFD-controlled PMSM's are said to produce constant maximum torque up to the rated speed. Above the rated speed the VFD performs defluxing and produces constant power. This should then mean that at 200%...
- 420
0
votes
0
answers
40
views
What does the Torque sign mean in FEMM?
I am working on a project on analysis of Synchronous Machine using FEMM and MATLAB. I am running a code to rotate the motor and record the values of the torque. I am exciting the stator with 3-phase ...
- 57
0
votes
1
answer
110
views
Is there a large difference between full-step and half-step stepper motors' torque at very low speeds?
I'm using a NEMA 23 for a solar tracker, which means my mechanism will move a single step every 5~10 minutes, and the step angle is 1.8 degrees which I need to bring down to 0.01 degrees.
Now I need ...
4
votes
3
answers
2k
views
DC motor spins faster in reverse
Due to certain circumstances I need to run my brushed DC motor in reverse (positive to black wire, negative to red wire).
What I noticed is that when set up this way running at no load requires 1.5A. ...
- 884
1
vote
2
answers
216
views
Can a BLDC motor still provide max torque for holding position when I run it at 24 V instead of 48 V?
I would like to do a Leg Robot project.
I have an AK80-64 BLDC motor from T-motor. The specification says it can be operated at 24 and 48 V.
Can the BLDC motor still provide max. torque for holding ...
- 11
0
votes
1
answer
473
views
Why does this DC motor increase in current and then decrease as the speed increases?
Well, the general answer to this is that as the motor needs to overcome the inertia from its state of rest, it requires high starting torque and aka high current is consumed to do that work.
On the ...
0
votes
0
answers
884
views
How to calculate torque of a three-phase induction motor?
I have a three-phase induction machine with following nameplate data:
\$V_{s_n}=\frac{425}{\sqrt{3}}\,\mathrm{V}\$ - effective value of the phase voltage,
\$f_n=70\,\mathrm{Hz}\$ - nominal frequency,
\...
- 1,061
0
votes
1
answer
140
views
Using a BLDC for variable counter-torque
I have a project in mind where rather than using weights for resistance in exercise training, I would use a BLDC for resistance. I want to have a pulley system hooked up to a BLDC, similar to the ...
1
vote
0
answers
81
views
DC Motor Time to Attain Full Speed Formula Origin
There is no formal discussion but I see a formula that relates the average available torque to moment of inertia in problems from Electrical Technology by Theraja. I have tried searching about this ...
- 439
0
votes
1
answer
84
views
Transfer function of two frequency spectra
When you have two amplitude frequency spectra (fourier spectrum), in this case of a torque ripple, how do you define the transfer function (or the ratio) between both? How do you "divide" ...
0
votes
3
answers
1k
views
Why does higher voltage produce better torque from stepper motors?
I'm working with stepper motors and I have a question.
I have found that if I use a higher voltage switching source, I get better torques from the motor. Why is this?
0
votes
1
answer
98
views
Can you use a DC brushless motor as a torque motor?
I've got an outrunner brushless DC motor (Flipsky 63100 190KV 5500W if that's relevant). It'll be used to spin normally sometimes, but I also need it at other times to give resistance to motion.
...
- 103
0
votes
0
answers
77
views
Choosing a motor
Long time listener, first time caller etc! Also, if you think this could be better answered somewhere else please let me know.
I'm building a pottery wheel at the moment and I'm in a bit of a quandary ...
2
votes
1
answer
169
views
Some doubts regarding electronic throttle motor
I am trying to wrap my head around the working of electronic throttle bodies. So they usually have a brushed Permanent Magnet DC Motor which actuates the throttle plate (butterfly valve) via a gear ...
- 131
0
votes
1
answer
241
views
Electrical torque and electrical power of a generator?
Having the electrical torque and the angular speed of a synchronous generator, can I calculate its electrical power output as the product between the electrical torque and its angular speed w (Pe=Tew) ...
1
vote
5
answers
471
views
Fundamental understanding of motor torque
I have the following elementary question regarding motors:
Motors provide mechanical torque as output. Every motor has a particular torque-speed characteristic curve which tells us how much torque the ...
- 131
0
votes
0
answers
32
views
What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?
I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
0
votes
3
answers
88
views
Need to limit the torque on a spooler
I'm a newbie to DC motors. I'm trying to use a geared DC motor of 150RPM 70Ncm torque to pull in rope on a small spool. The rope is being released by other equipment. This rope is being released at ...
- 1
0
votes
2
answers
2k
views
How to calculate torque constant and back EMF constant of a BLDC motor?
I have a BLDC motor to run for a fan. The parameters are as follows:
Electrical frequency measured: 61.936 Hz
Pole pairs: 8
Line voltage measured: 70.365 V RMS
Line voltage peak: 99.51113732 ...
- 31
0
votes
2
answers
292
views
How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?
I've been tasked with carrying out some design improvements on my company's production floor.
There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
- 3
0
votes
1
answer
332
views
How to check for the specification of the motor to lift a certain weight? [duplicate]
I'm trying to figure out how much power, torque and rpm required for a motor to carry 2-3 kg (including his own weight). Also, the speed at which the weight is lifted doesn't really matter as much as ...
1
vote
0
answers
166
views
How to obtain torque constant for stepper motor?
I want to measure the torque constant of a stepper motor but seems I am doing it wrong.
I have an MST342C02 stepper motor (200 step/rev and 4 phases) with SMD42C2 Driver. I have a converter that gives ...
- 11
0
votes
3
answers
208
views
Small brushless motors: What are the inherent trade-offs between 56V and 18V motors? [closed]
While researching tools in the quest to become a handyman, I was captivated by the fact that one of the top brands sells 54V (60V max) cordless power tools while another sticks to 18V. Two questions ...
0
votes
3
answers
360
views
Stepper motors both rated for higher current but the NEMA 23 stops and the NEMA 17 keeps going, could it be a (hardware) low quality motor issue?
I am using the DRV8825 stepper motor driver. The NEMA 17 is rated for 1.2 A and the NEMA 23 I'm using says it's rated for 2A. I have two NEMA 23s and they both soon choke out (stop moving).
When I was ...
- 616
0
votes
0
answers
70
views
Q: Motor sizing for reeling application
I would like to ask for some help.
My application is regulation of vertical speed of the camera, which is mounted on winding/unwinding reel. The camera follows the object (which moves vertically).
The ...
- 21